Abstract
Virgin samples of equivalent mass fractions from a PVC/PS (polyvinyl chloride/polystyrene) polymer blend were prepared together with other samples of the same composition containing different concentrations of silica nanoparticles obtained from rice husk by a surfactant-free sol-gel method. The obtained samples were characterized and tested for their variations in optical properties using spectroscopic techniques. Fourier transform infrared spectroscopy (FTIR) optical absorption spectra reveal the presence of the main structural groups with a small variation of their intensity and position which is attributed to the interaction between the filler and polymeric matrix. UV/vis optical absorption spectra show a variation in absorption intensity with increase in filler intensity combined with a change in their optical energy gap. The value of the direct and indirect optical energy gap was found to be concentration dependent.
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